I suppose I should finish this ... or at least skim the end to see who done it.... it is a bit 'meh', though... not nearly as good as the first two. And even those had at least a slight scent of 'stretching for effect'.
One senses that the author is aware of not wanting to offend or make mistakes.
Obviously, the bitter fruits (from the reader's perspective) of financial and 'literary' success... from the author's perspective.
Having found the 'who', I've lowered my rating. The answer is....
BIG SPOILER COMING...one of the trees..., and the one that should have been obvious from the start
Why give away the answer...? irritation, I guess... For despite its obviousness, in retrospect, the answer really was not well prepared. Disappointing